How to use the signac.common.config.read_config_file function in signac

def main_config_show(args):
    cfg = None
    if args.local and args.globalcfg:
        raise ValueError(
            "You can specify either -l/--local or -g/--global, not both.")
    elif args.local:
        for fn in config.CONFIG_FILENAMES:
            if os.path.isfile(fn):
                if cfg is None:
                    cfg = config.read_config_file(fn)
                else:
                    cfg.merge(config.read_config_file(fn))
    elif args.globalcfg:
        cfg = config.read_config_file(config.FN_CONFIG)
    else:
        cfg = config.load_config()
    if cfg is None:
        if args.local and args.globalcfg:
            mode = ' local or global '
        elif args.local:
            mode = ' local '
        elif args.globalcfg:
            mode = ' global '
        else:
            mode = ''
        _print_err("Did not find a{}configuration file.".format(mode))
        return
    for key in args.key:
        for kt in key.split('.'):
            cfg = cfg.get(kt)

fn_config = None
    if args.local and args.globalcfg:
        raise ValueError(
            "You can specify either -l/--local or -g/--global, not both.")
    elif args.local:
        for fn_config in config.CONFIG_FILENAMES:
            if os.path.isfile(fn_config):
                break
    elif args.globalcfg:
        fn_config = config.FN_CONFIG
    else:
        raise ValueError(
            "You need to specify either -l/--local or -g/--global "
            "to specify which configuration to modify.")
    try:
        cfg = config.read_config_file(fn_config)
    except OSError:
        cfg = config.get_config(fn_config)
    keys = args.key.split('.')
    if keys[-1].endswith('password'):
        raise RuntimeError(
            "Passwords need to be set with `{} config host "
            "HOSTNAME -p`!".format(os.path.basename(sys.argv[0])))
    else:
        if len(args.value) == 0:
            raise ValueError("No value argument provided!")
        elif len(args.value) == 1:
            args.value = args.value[0]
    sec = cfg
    for key in keys[:-1]:
        sec = sec.setdefault(key, dict())
    try:

args.storage = DEFAULT_STORAGE
    c_args = {
        'project':  args.project_name,
        'signac_version': args.signac_version,
    }
    if args.workspace:
        make_dir(args.workspace)
        c_args['workspace_dir'] = args.workspace
    if args.storage:
        make_dir(args.storage)
        c_args['filestorage_dir'] = args.storage
    if args.db_host:
        c_args['database_host'] = args.db_host
    fn_config = os.path.join(args.directory, 'signac.rc')
    try:
        config = read_config_file(fn_config)
    except FileNotFoundError:
        config = get_config()
    config.update(c_args)
    config.verify()
    return config

def main_config_show(args):
    cfg = None
    if args.local and args.globalcfg:
        raise ValueError(
            "You can specify either -l/--local or -g/--global, not both.")
    elif args.local:
        for fn in config.CONFIG_FILENAMES:
            if os.path.isfile(fn):
                if cfg is None:
                    cfg = config.read_config_file(fn)
                else:
                    cfg.merge(config.read_config_file(fn))
    elif args.globalcfg:
        cfg = config.read_config_file(config.FN_CONFIG)
    else:
        cfg = config.load_config()
    if cfg is None:
        if args.local and args.globalcfg:
            mode = ' local or global '
        elif args.local:
            mode = ' local '
        elif args.globalcfg:
            mode = ' global '
        else:
            mode = ''
        _print_err("Did not find a{}configuration file.".format(mode))
        return
    for key in args.key:

def get_config(args, for_writing=False):
    try:
        if args._global:
            config_ = config.read_config_file(USER_GLOBAL)
        elif args.config:
            config_ = config.read_config_file(args.config)
        elif for_writing:
            config_ = config.read_config_file(USER_LOCAL)
        else:
            config_ = config.load_config()
    except FileNotFoundError:
        pass
    return config_